From: Mark Lord <kernel@teksavvy.com>
Date: Fri, 24 Sep 2010 13:51:13 +0000 (-0400)
Subject: block: Prevent hang_check firing during long I/O
X-Git-Tag: v2.6.37-rc1~168^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b1977698ceb4c4caa800d475127139da49966f9;p=pandora-kernel.git

block: Prevent hang_check firing during long I/O

During long I/O operations, the hang_check timer may fire,
trigger stack dumps that unnecessarily alarm the user.

Eg.  hdparm --security-erase NULL /dev/sdb  ## can take *hours* to complete

So, if hang_check is armed, we should wake up periodically
to prevent it from triggering.  This patch uses a wake-up interval
equal to half the hang_check timer period, which keeps overhead low enough.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---

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